Real Estate Intangibles (Details 1) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Real Estate Intangible Amortization [Abstract]
Rental income related to above/below market tenant leases, net	$ 179,000	$ 235,000	$ 423,000	$ 596,000
Property operating expenses related to above/below market ground leases, net	(317,000)	(303,000)	(926,000)	(909,000)
Depreciation and amortization related to in place lease intangibles and lease commissions	$ (46,366,000)	$ (78,782,000)	$ (185,363,000)	$ (168,441,000)